local t2short = require("t2short")
---table转字符串
---@param  v table|string|function|thread|userdata|userdata
---@param  b string|nil @开头字符串
---@param  e string|nil @结尾字符串
---@return string
return function(v, b, e)
    local len, list = t2short(v, b, e)
    return table.concat(list, nil, 1, len)
end
